VCM-DAS-3 datasheet(20/42 Pages) ETC2

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Bit Mode Configuration

VCM-DAS-3 Reference Manual

Bit Mode Configuration

The VCM-DAS-3 can operate using 8-bit or16-bit ISA transactions. For compatibility with 8-bit

ISA buses, you must set the VCM-DAS-3 to use 8-bit ISA transactions.

Jumper V1[15-16] selects the bit mode. When a jumper is present, the board will operate on

either 16-bit or 8-bit ISA bus. When the jumper is removed, the board is forced to perform only

8-bit ISA transactions. The default setting is jumper installed.

Enhanced Mode Configuration

Jumper V1[13-14] enables you to select between compatible or enhanced modes. A jumper

installed on V1[13-14] sets the VCM-DAS-3 to enhanced mode. When no jumper is installed, the

board operates in compatible mode. The default mode is enhanced.

In compatible mode, eight registers are decoded for use, including all the registers needed for

DAC and DIO operations and control. These registers are identical to those provided by the

Diamond Systems Ruby-MM, and enable full compatibility in applications designed with that

board. In this mode, analog output ranges are determined by jumper settings (in two banks of

eight registers) and are not software programmable.

Enhanced mode provides three additional registers for more specific control of DAC operations.

The ENH_CON register enables you to set spans for specific DAC channels, read DAC data and

spans, set DAC channels to sleep mode for power savings, and set and read the gain for all

channels.

Power-up Span Range Configuration

Jumper block V2 sets the initial span range for A/D channels 7-0. Jumper block V3 sets the initial

span range for A/D channels 15-8. (See Table 5 for a list of settings.) The span range can be set

differently for each 8-channel bank. Within each bank, all channels will have the same initial

span range; however, in enhanced mode, ranges can be set individually for each channel via

software.

Two unipolar output ranges (0V to 5V and 0V to 10V), and four bipolar ranges (±2.5V, ±5V,

±10V and -2.5V to 7.5V) are available.

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